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Unformatted text preview: aljabr (faa335) Hw27 Ross (89251) 1 This printout should have 11 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. 001 10.0 points Pure helium gas is admitted into a tank con taining a movable piston. The initial vol ume, pressure, and temperature of the gas are . 047 m 3 , 197 kPa, and 421 K. If the volume is decreased to 0 . 011 m 3 and the pressure is increased to 480 kPa, find the final temperature of the gas. Correct answer: 240 . 078 K. Explanation: Given : V i = 0 . 047 m 3 , P i = 197 kPa , T i = 421 K , V f = 0 . 011 m 3 , and P f = 480 kPa . If no gas escapes from the tank, the number of moles remains constant; therefore, using the equation P V = nRT at the initial and final points gives P i V i T i = P f V f T f T f = P f V f T i P i V i = (480 kPa) ( . 011 m 3 ) (421 K) (197 kPa) (0 . 047 m 3 ) = 240 . 078 K . 002 (part 1 of 2) 10.0 points A sphere 30 cm in diameter contains an ideal gas at 1 . 2 atm and 15 C. As the sphere is heated to 119 C, gas is allowed to escape. The valve is closed and the sphere is placed in an icewater bath. How many moles of gas escape from the sphere as it warms? Correct answer: 0 . 190402 mol. Explanation: Given : r = 30 cm 2 = 0 . 15 m , P = 1 . 2 atm , T 1 = 15 C = 288 K , T 2 = 119 C = 392 K , and R = 8 . 31451 J / K mol ....
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This note was uploaded on 01/27/2011 for the course PHYS 251 taught by Professor Gavrine during the Spring '10 term at Purdue UniversityWest Lafayette.
 Spring '10
 Gavrine

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